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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c1973a73a7d30e0fff1dc8351b3be22c59ed0b12a2ed96f068118a6fbfd7af' 
  AND token = 'RPhmP0pZtu3Feiu4jdmMSvPlRfPdD7MBOixW9ym2FI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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