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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a65207463fae5f9b2775a22f1b53e3ddd6cf5a0c147de7bdaa6216205f7f0b8' 
  AND token = 'edOJ7dgEjLtTXfdmOiOHC20dvMhchgP9ewAgnMdb5N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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