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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73fd371c455fc4daa102af3b1cd1337b7ea65382f3baa5b0bb145e60f77a939' 
  AND token = 'SZSaQLRyJTeLKKJxa+af6SVoNZzZ+8P5pmb32JovsaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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