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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1751db5d12e7952a88984f25fd3f6bbd8b601c977eef668c21cdd8a49c7c89b3' 
  AND token = 'BR40iJjM37wSPDUWKPyc6+6MyPh7QbPFbpF9MeyZebk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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