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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceec22fb1055b12da4125ba99811ed289c97daf1c4b44185aac7e28235a203d3' 
  AND token = 'hJvxX5W9fue+n2uoKBSF+CB3bIkoq7M/oLoQ3nh1rQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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