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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2136a2e235b4e7d9020ba52b8deeced9bba16ddc4ad50d93d3decdc713604d6' 
  AND token = 'qDjU9WRs4uujbfXJ3oAW7FAsIfLFiXJmLNfRtQpIkJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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