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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df3987ca0d59274d69f358c0f6e46f0f2ee3b768495e4668f4d9c9f6be2c77e' 
  AND token = 'wHN1gW8K2Tw+02LLRT/kkvdaujA1ICDr+F9prmNRk60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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