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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff609834d6ffb918ad6e2f43e53ed5747d5cacd27b634f3801842e56714450f0' 
  AND token = 'WWQ+Y+wl8qMqiXPE81I1c4mR17vwW+qJWRm8gMb2XCY=' 
  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"
    }
  }
}