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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f018362a3c1bea8f23667cf57839b1a1142e01cd44c5a38b6e45a7d384d2ed36' 
  AND token = '88HNQyuVegpr6nNownq30pDqHn+CCIeb07BmtjG1Vhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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