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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ffdd70edb7e1d432bdbd0b4208c79be4077ef47b0db7d72bad66ff491796f4' 
  AND token = 'k6V5wKGVUqxJnNTj/1oB1RM1wITX8SDiCN8XPxYGK2Q=' 
  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"
    }
  }
}