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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67aa5f86ae2e3797d0f21e740fd2c6ce6238d36ae250cc03ffdb0b851ab89798' 
  AND token = '9/Kcr8J4gx77MZsEa3wBL/7qDcOHExysgqnH4E2VPgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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