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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bd34f3b21380b41b3d55cc4d57d25772f91d8d813e090233536e416b0d5a77' 
  AND token = 'prmkoFQu8TS87CmmAl4i52qPXyw2GzRCo1cAj6Bup2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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