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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f8c1e5b6893736e5a8ea7b6412bdeba2a5d3ed2ceff6dd5cdab3bf07334d95' 
  AND token = '9qLvjd5quIFZ/CVyqHRP9knu69ke4N7EeJ3cpSGrcaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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