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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd024ad979d6198a880ec78d9f107b53a73013549fd95f864272bb4a6a20aacc9' 
  AND token = 'S/wA5kZN436Puuzk981ffTuGcLP/cFe0bVwem2E7NeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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