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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c97315633fdf89d0346179a80a2edcbe6423615fe2ad2d8f5a5ac8310dd74f' 
  AND token = '1+kxTU9jE+LVIO/3mE1HZilRAx7BqYmA1BottGW+AWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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