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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfc1e4a8b81ca89539c6efd6d23fa3317a7caf103cce34b0d88721e4acb90ea' 
  AND token = 'Q6BnVbTEhjUZuzfKA+rrTLy7mxg6LYkr6BRtVq9GMUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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