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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f690e62d4d601e9e8e354f5101b4d5be8ea0f6a56cc19eafab0ab30ef9644d' 
  AND token = '/+pVAS70RuOd7tqjBCBU27ePE9f51udutaeqeGHTzKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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