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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fe7874d76ff18a4bd1da69dcecd26872ed6dd58cd019368e9afd0af47999bc' 
  AND token = 'RdG3JRBlrGCMwY1E3JzN7n6wC2gNUSyaYGdXosj3O6Y=' 
  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"
    }
  }
}