SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b42987d4c263a29f221748d695433291f457fdac82aeb893a91e4f76a676b10' 
  AND token = 'HCONYHDLjnqVWdDFKmsz4fF2llWbJ8276/yrSBxvaBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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