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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fdea93998c514ad52f9529cc9b014cb47ff18173bf62fb00409a1d8b778822' 
  AND token = 'j2ER4N3ogjwY26OtTtqLw3punG5mPDRsUV8SKn50C9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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