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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b2d930f8c1b7e0e9453c18cc18cc0ac6a3ed137b2aec7df59da9ca3b360a58' 
  AND token = 'tK5yPlh8ZkapfEsPO5fyAlGr8DX6J7JXfSrY1eYfsSY=' 
  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"
    }
  }
}