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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524d806c94acc35027fa8f099bd9ef1ba38da0d5e866dfcd97eabf5847c73717' 
  AND token = 'obeY6pjLk9a1j4ubKscroStkDKk4TlTxVtDS8fqiHCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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