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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c4e5e09e61c5e6130cab078ffec2a545d181f0d96942dec0e463105cdff237' 
  AND token = '4eZyomyWXm50Ud9E5fp9VBKpTxLiMX48UdV/KsAl2B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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