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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78aa25911505726167f55451ba298a2b92b8b942e7c841dfea44f97a5af63b9e' 
  AND token = 'IomCdDFBMCm/oRA3ETEYMJntTrZji1Xk6tI/EuvPa4A=' 
  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"
    }
  }
}