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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516a15f9138615371fb8201b7151b2ac4c38e1c90d0ef4e5d3ed5a60110e7e89' 
  AND token = 'R35lxSdX6LA6bhQGsnhPu2364Mbyl3MMglh5CKzv6WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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