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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88df3ec34214c15bee6eec89d7f6cd14263f4d8a307120d3536f1094ed460fc3' 
  AND token = 'Ie8papfi1ME658B6PrPBJTs5KpCTlvMJwA2L/2I8obg=' 
  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"
    }
  }
}