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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ff70a723445c17c76735dbf516dc6f0a9f69700f707665c7e2520199258ebf' 
  AND token = 'py71I+SqgBMYp4UaAa7Tb0tG7yrkUqq48Tc0jhkLVtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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