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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c89f47a7a497d76628b24361fe98138b460c1a044abcb653c49237afe61e88' 
  AND token = 'rN+CC0acyk24mFEgli5OYmJaVf6u9FVf2dYQ6bZ3z0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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