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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a20a098790e6e29edb3407357da10a2e01fd80973fc37f1835d5f2ed139d0a1' 
  AND token = 'hOlgA8SaBAhTGFz/vIm+n4yRN1gHAHZMO5I2skLh6kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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