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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30734c64b92b78c92d6c4f2ef177560f2e94b6b7cc2c017b26fe315d5cfd818a' 
  AND token = 'eP8ce8AAeRCHM0bzVtq/W7AkTPlL2cTrYOV6mFzTKRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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