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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13279db9220e18e3a3eb7e1789e6f3135358d41fb28805e6e76e92bd9b236214' 
  AND token = 'vWrwY+BPqjtJ3ME4HJ1VxqFtqrfm4tcORZqeg2v8WZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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