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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56204bd691064f5048c75dbf4185b8e35273953628201e2d4701a1ba16794802' 
  AND token = '7tcY6D2b9dHz/4OAaNJGk8Ydw4b6SO3FKcM3wkgz/W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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