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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d956425e6d522992dffeb58b8120d79d97b60852303df7d59680d0f7868cc2' 
  AND token = 'diZEFMTmMrEz1PrCxEMHklV0mhRFc3kAdruVl3/3XWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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