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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae67672e7d078ea2ce8d0fc7e349b1f9798172e4ccae9b0bf99b72419f4cf44' 
  AND token = '6mDb7VO4S9s+d4YbNJqhCc7udlKCViTr52nmoyH8lcY=' 
  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"
    }
  }
}