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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fd579ab7d111c846311f196268829ddb11e6f9bce1ab66c1b77c10eb75f4f8' 
  AND token = 'B2IkpqKZaLN2fswumUs3qjwqwS/YuPa+CkEfP1ik/ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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