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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a609879ff7b85f825fb3c41b02784ed728d51ca17822d3d65a470edd8c20a924' 
  AND token = 'PwzVR1+GLsPMaCrnEPFPn/r4dwh6O9zHRnpcI9fdN0M=' 
  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"
    }
  }
}