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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f4de0bdfa97cfe37f2998c36b279b7f7a7202463dd01495427780a959eedb8' 
  AND token = 'I5EN279EzQO4xOQd/ZEROxaXmW1jdpWCxIQ6HOQTCl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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