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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470ec32ea8de035051fe0387db9b1e1a04f249f4b581ed319a9872809757a0f7' 
  AND token = '+DrHOyrCDjBhDROIAyE8OQz8Gy9ry9X9psBhgUMDOrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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