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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd429fb496e1e3804041e0c735fcd76c47b541180fa8e21488552f530bf04b2f7' 
  AND token = '4Xsd4tlNeF0/x0pOLLbS9L7vDRe4QASHC8RVZuF6cas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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