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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0dd084df7507e1684ba56af423376896bd7fbbda430c7877e7acbbc73b5557' 
  AND token = 'M5iZxAGo5g2/c+AY0o0SOR83IzGPQ73Yg2P4MyAGTp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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