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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7d866de40c7166f69c68bc10b07fb63bb7b6ad740da46d425559c560ff2530' 
  AND token = '9S+JN1yLyq+acl5T1/p5AV4gyB8KxidGRQtvLJh+qqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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