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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a628e3992f11470ce5fdb37ec232766ebb6f33fdf0d17b8da858a0df1517e2b' 
  AND token = 'jdANy00+yWZnIhuDOtZ7MUq91yCB7b8n0g8NbndyogQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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