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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f7f378d39d1353d3e5bd8fd25ad835c80104b08a631e3ad9c68aa48193e882' 
  AND token = 'phRuw+MR/qGIhTJrd4BgaM1sRmvsdD14zKg8qIyWtH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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