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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d77815c84e08637f09a00812825198c935d23cc536c58272fce879c168c9340' 
  AND token = 'x6xcZMl0ByGhRlc/4nLT2aJakkE73EdfsHKr1/q5MRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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