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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b84c4525c0ddbb8ec02b37dc2fdc6c79d8d26ecf944f76583b2d7a96ae9d0a' 
  AND token = '7OF7ZgTsZcojmgbTYI+n7PRH24OTpRuvYY3C614pvK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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