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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093bc740658aa14482b03855a2fe3f5412c806b34578e1592e92ffb0eb29ea96' 
  AND token = 'rEiu/g4244TkHL+9TKSJewJwZU1TmnHrIxfx4iv8g/c=' 
  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"
    }
  }
}