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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21019700aa43685be733e90438c2253c7d7949aafafddef75389ed1795b3f46b' 
  AND token = 'ycYKduYZy1WwR8vp8dfDX3ACc4A7CpAgkNRVMFEwtA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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