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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4282e937794213ffbc2d9e05a76c8e6fb1ba5d29bba8aaf48e4cc56fbd4db6e6' 
  AND token = 'HPUaoZdEM4vrk13ygu21pwyehw0IVYDqWoHe8dz0yNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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