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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f8bf21323dbe4da443a1ea7aa2fca79bbe881b680faee0964b19f196803d10' 
  AND token = 'uqCCS+/xyFvvWzr4NyP2BSpCBW64dfOmchxLjjT1IzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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