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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6b43df1f4745a3a545b239b12aee3e0404e8d39e568dc97e8fce702db896b2' 
  AND token = 'APrObCX6OLViq2SRukozrusJTjecvq2C7AmP6SuAqfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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