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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c4d5874cc31e94e2a6d4052bbbf478951c33744030fa4c73f3bfd02abe179b' 
  AND token = 'vZFPnFr82YPZLRJZHTJVwy/9QQacMLtWlXc+Ro0g89c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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