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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e74ecc38d8aedab877a1097cd0ed5bc444db10e287acdc951647cd6e2800758' 
  AND token = 'btuzA9SIzM7tAAgMc/iJi+XNmFp17TNtdr+6/6xONnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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