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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327b53c1dcb017ffb6f9d314a8e6dde8f8c1e24e5dc58d680469fb672d66efd4' 
  AND token = '3zcfTjHokZl3OT9hy7FRpFM9QIG7bR4m+9uUm6ba8WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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