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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635f941fad7d491ed0f273daf90407c6b6e4f7b20236dde4695affca272678e6' 
  AND token = 'w0u77ss34RqkGyAtdAcR0JgW5cOzZmhmqIvc1hd/CYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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