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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58cdcf365310a6425b0396989897bdf8e3fba9f3c65877d1ffb3e0332033343' 
  AND token = 'cXTQE3DJ0R+g1SCtdxtgOOy6ZahQw+npmzPVp7bdNP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}