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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6021beb9d18a2ff013df07250ee888054bd214c767d08aedbfb4a7f52e12bdc' 
  AND token = 'XONulijUj/Ovm079Z8wgig4S71SzXmZhIjIzlYYx5cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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